Centrifugal-impact dry pulverizer.



No. 878,878. PATENTED FEB. 11, 1908.

L. c. GRAUPNER.

CENTRIPUGALTMPAUT DRY PULVERIZER APPLICATION FILED APB.1.1907A INVENTOR: Z4145 J. A BY I S TTOR E UNITED STATES PATENT onrron.

LOUIS C. GRAUPNER, OF SAN FRANCISCO, CALIFORNIA.

CENTRIFUGAL-IMPACT DRY PULVERIZER.

Specification of Letters Patent.

Patented Feb. 11, 1908.

Application filed April 1, 1907- Serial No. 365.78

a clay, rock, talc, quartz and other materials,

by centrifugal force and impact, and in classifying the same by pneumatic construction.

It consists in the combination of parts and in details of construction which will be more fully explained by reference to the-accompanying drawings, in which- Figure 1 is a vertical section showing the wheel partly sectioned. Fig. 2 is a transverse vertical section of a portion of the case and wheel.

This invention is designed to provide an apparatus for pulverizing dry materials by impact, caused by centrifugal force; first, against a circumferential steel ring, and secondly against a die-by the residual momentum caused by a discharge from the first impact through a nozzle, and in a means for classifying the material and constantly discharging the products of different fineness.

In the operation of pulverizing dry material by centrifugal appliances commonly used with open wing wheels, the power is not completely exhausted, and impact of the material againstthe circumferential surface is effected more as a glancing blow, the flying particles of material not being brought to a full stop, and the power in the remaining momentum is thus to a great extent lost.

In my apparatus, the material to be crushed is admitted througha central core or chamber of the wheel, which may be made of cast metal. This central portion 2 is made convergent outwardly from the end. of the hub or central portion through which the material is delivered, and. there may be as many of these directing cones 2 as will be operative within the wheel. At the outer end of these cones, the radial tubes 3 are connected, and the ends of these tubes discharge against the inner faces of the steel rings 4, these rings being located between the annular side plates or disks 5, which extend inwardly to a point contiguous to the mouth of the discharge tubes 3. The inner edges of these plates are beveled. or inclined as shown at 5 to insure the delivery of all the gnaterial toward the outside, and against the ies 4.

It will be seen that when the central hub and discharge tubes are in a state of ra id revolution, the material to be pulverized is received into the tubes during the time that they are passing from below a horizontal position to a point roXimate to or just beyond a vertical position with the mouths of the tubes presented downwardly. During this portion of the movement, the material is violently ejected by centrifugal force striking against the stationary circular dies 4; but the movement of this blow will be necessarily a diagonal and glancing movement. The force of the momentum not being entirely expended, the material is therefore constantly carried on from its point of impact upon the dies 4, passing out upon a tapering steel nozzle 6 which connects with the casing, and with an opening through the steel die in the direction of this discharge. In line with this nozzle is a steel die 7 held in a die socket 8, as shown, and against this steel die, the material is projected with the remaining force and momentum of its discharge, thus pulverizing it to the finest possible extent. The end of the nozzle 6 and the die 7 are contained within a separating chamber 9. The lower part of this chamber has a discharge passage 10 through which any material too coarse to be otherwise disposed.

of, will constantly fall, and from which it may be returned to the centrifugal crusher i 11 is an opening at the top of the chamber,

and this chamber is connected with any vacuum or suction apparatus, and not here shown. The vacuum or suction through the passage 11 withdraws all the material which is sufficiently fine to be thus withdrawn,

thus classifying and separating the pulverized material at once.

It will be apparent that a large quantity of air will be drawn in, and discharged with the ore through the radial tubes so that with .a revolution of about 2000 per minute an air blast of approximately 18000 feet per minute will result, and this acting in unison with the previously mentioned resultant from the centrifugal impact, will continue the movement of the ore, and drive it with great velolcity against the flat die to complete the wor c.

Having thus described my invention, what I claim and desire to secure by Letters Patent is i 1. In a centrifugal pulverizer, a central revoluble hub, radial arms converging outwardly, guide tubes extending radially from the ends of said arms, a ring die against which the material is discharged by the momentum of revolution, a discharge nozzle, and a die in line with said nozzle against which the material is delivered by its final momentum.

2. In a dry pulverizing and classifying machine, revoluble tubular radial guides, means for supplying material centrally and to the inner ends of the tubes, a stationary ring die against the inner periphery of which the material is thrown by centrifugal force, said die having a tangential opening and a guide nozzle, a chamber with an inclosed die in line with the nozzle and co-acting devices by which the chamber is constantly cleaned of pulverized material.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

LOUIS O. GRAUPNER. Witnesses:

M. MATTENAY, P. J. KENNEDY. 

